Year annual % 1961 5.379168062444791 1962 0.5941937572937519 1963 4.879911729382002 1964 2.7902911025755657 1965 -2.4342903067840638 1966 2.729122729640636 1967 -1.1834904167882172 1968 0.8898369096398824 1969 1.7240539884896435 1970 3.5204957452206713 1971 2.9705377095911416 1972 6.275537555139763 1973 10.445534801360196 1974 19.53736507170629 1975 14.30327863607826 1976 24.33612099397537 1977 18.160817389765043 1978 9.159910193217343 1979 10.037571812200866 1980 12.988319751133929 1981 17.734391373934486 1982 19.01931328621427 1983 21.5715014723378 1984 20.443525963358283 1985 34.02541419235311 1986 25.460139371404182 1987 35.347569375278226 1988 36.37428997730811 1989 20.600743960089602 1990 22.449185683892665 1991 28.112604357592147 1992 25.375481122157055 1993 24.461986330207324 1994 31.16995427443402 1995 26.86195135633244 1996 19.31365584041467 1997 20.58723214725535 1998 14.222113626203338 1999 11.540000000019404 2000 8.201104247137422 2001 4.81596921527445 2002 7.233030679335897 2003 8.41868264342142 2004 6.885623130454576 2005 6.426202523248506 2006 5.510095287497236 2007 9.099389527587377 2008 16.380754629426562 2009 9.04166245405979 2010 9.428716252961493 2011 12.198422878403363 2012 10.48389399740384 2013 9.66618357795825 2014 6.050845889355514 2015 7.591364023322413 2016 7.472033667597273 2017 2.63812393333545 2018 3.0413622386799943 2019 2.280408930017302 2020 6.423013990386806 2021 2.674303273893969 2022 2.762614833371984 2023 2.797828615026816